import sys
import subprocess

if len(sys.argv) <= 1:
    print('Usage: pgp-sign.py [files]')
    exit(1)

for file_ in sys.argv[1:]:
    print(f'Signing {file_} ...')
    proc = subprocess.run(['gpg', '--armor', '--detach-sign', '--output', '-', '--local-user', 'papatutuwawa@polynom.me', file_],
                          capture_output=True, check=True)
    signature = proc.stdout.decode('utf-8')[:-1]
    with open(file_, 'r') as fh:
        content = fh.read().replace('%%%SIGNED_PAGES_PGP_SIGNATURE%%%', signature)
    with open(file_, 'w') as fh:
        fh.write(content)